Cyperus pseudovegetus

Steudel
Syn. Pl. Glumac. 2: 24. 1855.
IllustratedEndemic
Treatment appears in FNA Volume 23. Treatment on page 156. Mentioned on page 143.

Herbs, perennial, cespitose; rhizomes upright, 5–8 mm diam., indurate. Culms trigonous, 30–50(–80) cm × 1.8–2.5 mm, glabrous. Leaves 4–7(–10), V-shaped, (20–)40–60 cm × 4.5–8 mm. Inflorescences: heads dense, hemispheric, 7–15(–18) mm diam; or if rays absent, heads dense, irregularly lobate, 2–3.5 cm diam.; rays 3–6, 1–30 mm; 2d order rays infrequently present, to 5 mm; bracts (5–)10–15(–40), horizontal to ascending at 30(–45)°, V-shaped, 6–30(–40) cm × 5–8(–10) mm. Spikelets 40–100, greenish white, flattened, ovoid, 3.5–5 × 3–4 mm; floral scales (8–)12–16, uniformly light greenish to light brown, laterally 1-ribbed, medially indistinctly 3-ribbed, basally 2-keeled, oblong-spatulate, widest at or above median, 2–2.5 × (0.7–)1–1.2 mm, apex minutely mucronate, scabridulous, infrequently glabrous. Flowers: stamen 1; anthers oblong, 0.7–1 mm, connective apex subulate, prolonged 0.1–0.2 mm; styles thick, confluent with apex of, and persistent on, achene, 0.5–0.8 mm; stigmas 0.6–1 mm. Achenes brown, stipitate, linear, slightly curved, 1.2–1.4 × 0.2(–0.3) mm, base whitish, stipe spongy, 0.1–0.2 × 0.2 mm, apex acute, surfaces papillose.


Phenology: Fruiting summer.
Habitat: Damp places
Elevation: 0–200 m

Distribution

V23 242-distribution-map.jpg

Ala., Ark., Del., D.C., Fla., Ga., Ill., Ind., Kans., Ky., La., Md., Mass., Mo., N.J., N.C., Okla., S.C., Tenn., Tex., Va.

Discussion

Cyperus pseudovegetus has been called “Cyperus vegetus Willd.” (M. L. Fernald 1950). The var. megalanthus Kükenthal of eastern Mexico and Central America recognized by M. F. Denton (1978b) is now considered a distinct species, C. megalanthus (Kükenthal) G. C. Tucker (see G. C. Tucker 1994).

Cyperus pseudovegetus is introduced in Massachusetts.

Selected References

None.

Lower Taxa

None.

... more about "Cyperus pseudovegetus"
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
Steudel +
Ala. +, Ark. +, Del. +, D.C. +, Fla. +, Ga. +, Ill. +, Ind. +, Kans. +, Ky. +, La. +, Md. +, Mass. +, Mo. +, N.J. +, N.C. +, Okla. +, S.C. +, Tenn. +, Tex. +  and Va. +
0–200 m +
Damp places +
Fruiting summer. +
Syn. Pl. Glumac. +
W1 +, Illustrated +  and Endemic +
Cyperus subg. Protocyperus +
Cyperus pseudovegetus +
Cyperus subg. Pycnostachys +
species +